Planoukaph co



K. KNUDSEN.

SWITCH LOCK.

APPLICATION FILED Nov. 11. 1918.

1 ,309, 36 1 a Patented July 8, 1919.

INVE/V TOR [Triad Merv g BV Mg Arm/mm THE COLUMBIA PLANouuAPu 50.,wAsHlNuToN. u. c.

UNITED STATES PATENT OFFICE.

KNUD KNUDSEN, OF PLAINVILLE, CONNECTICUT, ASSIGNOR TO THE TRUMBULLELECTRIC MANUFACTURING COLEIANY, OF PLAINVILLE, CONNECTICUT, A

CORPORATION OF CONNECTICUT.

SWITCH-LOCK.

AppIication filed November 11, 1918.

To all whomt may concern:

Be it known that I, KNUI) KNUnsnN, subject of the King of Denmark,(signified intention and taken out first papers and have applied forsecond papers,) residing at Plainville, Connecticut, have invented a newand useful Switch-Lock, of which the following is a specification.

The objects of this invention are to provide a simple and effective lockconstruction for securing an electric switch in a predeterminedposition. Briefly, the invention resides in the combination with themovable element of the switch and the operating member therefor, of astop carried by the operating member, and a relatively stationary stopdisposed to one side of the path of movement of the first stop so as notto be engaged thereby in the normal movement of the switch operatingmember, with a locking device detachably engageable with one of thestops and arranged to block the movement of one stop past the other.

Another feature of the invention is a guard for preventing thedisengagement of the locking device from the stop with which it isengaged.

Other features of the invention will appear as the specificationproceeds.

In the accompanying drawing, I have illustrated the invention embodiedin a practical commercial form, but as this illustration is primarilyfor the purposes of disclosure, it will be understood that variouschanges and modifications may be made without departing from the truespirit and scope of the invention as expressed in the appended claims.

In said drawing:

Figure 1, is a front view of a switch of the so-called inclosed orsafety type, the switch parts appearing locked in the open circuitposition, a portion of the locking mechanism being shown as broken awayand in section.

Fig. 2, is a broken side view 01 the same.

Fig. 3, is a detail perspective View of the locking parts.

In the switch disclosed, the movable switch element is in the form of aplurality of pivoted switch blades 5 adapted to engage the contact clips6, and the switch operating member is in the form of a pivoted handle 7connected with the movable switch element Specification of LettersPatent.

Patented July 8, 1919.

Serial No. 262,038.

through the medium of an arm 8 and connections therefrom.

The particular switch here shown is tensioned 111 a switch openingdirection by means of a switch opening spring 9 connected with the arm8, and provision is made for securing the switch in the closed circuitposition, said latter means taking the form of a latch 10.

The stop mechanism consists of an outstanding stop pin 11 on the innerside of the switch handle, and a relatively stationary stop pin 12disposed to one side of the path of movement of the handle carried pinso as not to be engaged thereby in the normal movement of the switchoperating handle. The stationary stop 12 is shown mounted on the side ofthe box 13 inclosing the switch parts, and the two stops are relativelypositioned so that one will just about clear the other, as indicated.

The actual locking is accomplished by engaging a locking device with oneof the stops which will serve to block the movement of one stop past theother. This locking device I have shown in the form of a padlock 14- ofa size and construction such that when engaged with one of the stops,usually the stop on the handle, it will positively block the movement ofthe one stop past the other and thus serve to effectively lock theswitch, or if desired, the hasp of the padlock may be engaged over bothof the stops.

To prevent accidental or surreptitious nisengagement of this lockingdevice from the stop with which it is engaged, I have provided a guard15 having an arcnate groove 16 therein receiving the end of the handlecarried pin 11 and serving as a keeper therefor.

In the oil position of the switch the handle carried pin rests in theclosed end of the keeper slot, and disengagement of the padlock istherefore ei'l ectively guarded against. In the particular switch shown,the pin on the handle serves a double function in that it provides ahold for the latch 10 as well as one member of the stop mechanism.

I claim 1. In an electric switch, the combination with the movableswitch element and an operating member therefor, of switch locking meanscomprising a relatively stationary stop, a stop carried by the operatingmember in position to pass the stationary stop in the movement of theswitch operating member ancLa padlock engageable with one of said stopsto block the movement of one stop past the other.

2. In a switch of the character described, the combination with themovable switch element and an operating member therefor, of a relativelystationary stop, a stop carried by the operating member in position topass the stationary stop in the normal movement of the switch operatingmember, a locking device engageable with one of said stops to block themovement of one stop past the other and a guard for preventingdisengagement of said locking device from the stop with which it isengaged.

In an electric switch, the combination with the movable switch elementand an operating handle therefor, of an outstanding stop pin carried bysaid handle, a relatively stationary stop pin standing to one side ofthe path of movement of the handle carried pin, and a locking deviceengageable wit-h the stop pins to prevent the operation of the switch.

#l. In an electric switch, the combination with the movable switchelement and a pivoted operating handle therefor, of an outstanding stoppin carried by said handle, a relatively stationary stop pin standing toone side of the path of movement of the handle carried pin, a lockingdevice engageable over one of said stop pins to block the movement ofthe one stop pin past the other and a guard overlying the end of thestop pin with which the locking device is e11- gaged to preventdisengagement of said locking device therefrom.

5. In an electric switch the combination with the movable switch elementand a pivoted operating handle therefor, of an outstanding stop pincarried by said handle, a relatively stationary stop pin standing to oneside of the path of movement of the handle carried pin, a relativelystationary guard having a groove therein receiving the end of the handlecarried pin, and a locking device engageable over said pin to block themovement of such pin past the relatively stationary pin.

6. In a switch of the character described, the combination of a'movableswitch element, a pivoted operating handle therefor, an outstanding pincarried by said handle, a latch engageable with said pin to hold thehandle in one position, a relatively stationary stop pin disposed to oneside of the path of movement of the handle carried pin and at a pointadjacent the end of movement of the handle in the opposite direction,and a locking device engageable with one of the pins to block themovement of the handle carried pin past the relatively stationary pin.

KNUD KNUDSEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

